^MVC2 was recycling to the greatest degree possible (and that's not really a bad thing), they had a library of sprites and just used as many as they could from Street Fighter Alpha Series, X-Men Children of the Atom, Marvel Super Heroes, Darkstalkers etc etc.
I honestly think they shouldn't skimp on the SF characters, if they are using the framework engine again, I imagine it would be easy to import SF characters into the game, so why not include as many as possible? It's not like they would take up as much time as a totally original one. Kind of like Fighters Megamix using all the VF/FV characters because they could just import them without many changes.
But yeah, would like to see a nice range of characters for sure, but also think they should just go for sheer numbers when possible as well.